My 16yo son was lifting and injured himself. Been several months of recurrent pain after rest. Finally got an MRI and it showed a 3mm retrolisthesis. He has quit playing sports and is working on rehab. At the time of injury, he was in stellar shape with super strong abs. With conservative care and good exercise work ethic, how good is his outlook? Does his age help his prognosis since he still has some growing left to do? He can't even grow a mustache so I think he will grow at least another 1-2 inches in height (says the growth charts). Haven't found much on adolescent injuries of this sort. Thanks in advance.